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Square is a parallelogram with right angles and equal sides (Fig.35). A square is a particular case of a rectangle and a rhombus simultaneously; so, it has all their above mentioned properties. Trapezoid is a quadrangle, two opposite sides of which are parallel (Fig.36).
Shapes with Parallel Sides. There are several shapes that have parallel sides as a distinguishing feature. The most common are the parallelogram, the rectangle, the square, and the trapezoid. These are the ones that you will most often hear about as having parallel sides. The trapezoid has one pair of parallel sides. The parallelogram, rectangle, and square all have two pairs of parallel sides. Other less common shapes with parallel sides include any of the '-gons' with an even number of sides, such as a hexagon, octagon, decagon, etc.